Silencer mats under each shelf assure "library quiet" performance; choose from 4" or 5" castersRuggedly constructed from commercial grade cold rolled steel, with heavy-duty 16-gauge, 1" round tube steel frames. Components are precisely made to eliminate any sharp edges. Curved handles provide comfort. Includes 3 tiers. Two tiers have 2 sloped shelves per side, bottom shelf is flat. For quiet operation, all undersides are covered with sound-absorbing acoustic material. Sloped shelves are 18-gauge steel and measure 6 3/4"D. Flat bottom shelf is made from 16-gauge steel and is 16 1/4"D, ideal for transporting oversized books or heavy parcels. Middle shelf clearance is 11 3/4"; bottom shelf clearance is 11". Includes 4 ball-bearing swivel casters for easy, quiet maneuvering.Choose from 4" or 5" casters, non-locking or locking:71: 4" non-locking casters71C: 5" non-locking casters71LC: 4" locking casters71CLC: 5" locking castersShips via Truck. FOB: ILCaster assembly required. Handle grips (keyword: handle pads), available and sold separately, are made of padded foam to provide comfortable, non-slip cushioning for your hands. Optional book truck bumpers (keyword: bumpers) slip onto the legs above casters to prevent trucks from bumping against furniture or walls. Finished with durable baked enamel paint available in 9 colors: -01 black, -02 blue, -08 desert sand, -18 red, -48 putty, -53 burgundy, -55 navy, -94 medium grey, -134 dark green To view finish choices, simply click on View Swatches located above.Overall dimensions:71 and 71LC: 39H x 33 3/4W x 17"D71C and 71CLC: 40H x 33 3/4W x 17"D